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  <h1 class="topictitle1">周期性执行备份</h1>
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   <p>将需要保护的NAS文件系统关联到指定SLA，系统将对这些资源按照SLA的定义周期性执行备份。</p>
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    <h4 class="sectiontitle">操作步骤</h4>
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     <li><span>选择<span class="uicontrol" id="nas_s_0018__zh-cn_topic_0000001839142377_uicontrol1247565664010">“<span id="nas_s_0018__zh-cn_topic_0000001839142377_text847555644011">保护</span> &gt; 文件系统 &gt; NAS文件系统”</span>。</span><p></p>
      <div class="note" id="nas_s_0018__zh-cn_topic_0000001839142377_note1911016143182">
       <img src="public_sys-resources/note_3.0-zh-cn.png"><span class="notetitle"> </span>
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        <p id="nas_s_0018__zh-cn_topic_0000001839142377_p1811010145186">对于1.5.0版本，请选择<span class="uicontrol" id="nas_s_0018__zh-cn_topic_0000001839142377_uicontrol1211016146184">“<span id="nas_s_0018__zh-cn_topic_0000001839142377_text51105144188">保护</span> &gt; 文件服务 &gt; NAS文件系统”</span>。</p>
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     <li><span>在需要保护的NAS文件系统所在行，单击<span class="uicontrol">“<span>更多</span> &gt; <span>保护</span> ”</span>。</span></li>
     <li><span>选择已创建的SLA。</span><p></p><p>您也可以单击<span class="uicontrol">“<span>创建</span>”</span>，创建新的SLA。</p> <p></p></li>
     <li><span>设置共享协议。</span><p></p><p>请指定备份文件系统时使用的共享协议，避免恢复时所选共享的协议与备份时指定的协议不一致，导致恢复时文件系统的元数据和权限信息丢失。</p>
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        <p>如果设置共享协议为CIFS协议，需要确保待保护的生产端NAS文件系统为NTFS安全模式，否则将导致备份失败。</p>
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     <li><span>选择执行备份任务的代理主机。</span></li>
     <li><span>单击<span class="uicontrol" id="nas_s_0018__zh-cn_topic_0000001792503842_uicontrol471113581111">“确定”</span>。</span><p></p><p id="nas_s_0018__zh-cn_topic_0000001792503842_p25041111535">如果当前系统时间已晚于该SLA首次备份的开始时间，则关联备份SLA后可以选择在当前立即执行备份或者根据SLA中设置的备份策略等待下次调度。</p> <p></p></li>
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